On proper orthogonal decomposition or K-L expansion to analyze transient sound pressure fields in linear acoustics

Georgiou, IT; Papadopoulos, CI

dc.contributor.author	Georgiou, IT	en
dc.contributor.author	Papadopoulos, CI	en
dc.date.accessioned	2014-03-01T02:49:32Z
dc.date.available	2014-03-01T02:49:32Z
dc.date.issued	2003	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34607
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-16544390486&partnerID=40&md5=6d7116b2c08a49e570a27a3634b4055a	en
dc.subject.other	Approximation theory	en
dc.subject.other	Boundary element method	en
dc.subject.other	Computational methods	en
dc.subject.other	Database systems	en
dc.subject.other	Finite element method	en
dc.subject.other	Harmonic analysis	en
dc.subject.other	Modal analysis	en
dc.subject.other	Navier Stokes equations	en
dc.subject.other	Problem solving	en
dc.subject.other	Stiffness	en
dc.subject.other	Linear acoustics	en
dc.subject.other	Sound pressure	en
dc.subject.other	Acoustic waves	en
dc.title	On proper orthogonal decomposition or K-L expansion to analyze transient sound pressure fields in linear acoustics	en
heal.type	conferenceItem	en
heal.publicationDate	2003	en
heal.abstract	Identification of the most energetic spatio-temporal patterns that govern the low-frequency dynamics of an air cavity excited by noise sources could lead to significant design improvements of enclosures for noise reduction / isolation and / or sound quality. In this work we show how the Proper Orthogonal Decomposition (POD) method can be applied to identify optimum spatio-temporal patterns governing the dynamics of the sound pressure field developed inside an air cavity. The novel feature of this approach resides into the fact that the POD technique is utilized to process databases for acoustic variables produced by state of the art computational methods in acoustics, such as the finite element method. For a cavity with rigid walls and excited by a harmonic point source, the POD technique reveals that the sound pressure field is composed of a very small number of Proper Orthogonal Modes, which are unique since they are optimum by construction. The POD technique identifies the shapes or patterns of these modes.	en
heal.journalName	American Society of Mechanical Engineers, Noise Control and Acoustics Division (Publication) NCA	en
dc.identifier.volume	30	en
dc.identifier.spage	205	en
dc.identifier.epage	212	en